Rotary fluid-pressure device.



O. W. JOHNSON.

ROTARY FLUID PRESSURE DEVIGE.

APPLICATION FILED APR. 10. I9II.

1,2975%. Patented Mar. 18, 1919.

2 SHEETS-SHEET l- INVE/VTUR 47770 W. JUH/VS'U/V BY ht I 0. W. JOHNSON.

ROTARY FLUED PRESSUREVDEVICE.

APPLICATION men APR. 10, 1911.

MD N

Patented Mar. 18, 1919.

2 SHEETSSHEET 2- reducing loss by. friction Y horizontal casmg, having--which can be used for the duit,.said-conduits be 'and usefulImprovements in. Rotary In the accompanying drawings,

' zontal section are hollow end casings UN T D STATES PATENTOFFICE.

" OTTO W. JOHNSON, OF SAN FRANCISCO;

stormy rnurn-rnnssuan Device To all whom it may concern:

Be it known that I,.O'rro VV JoHNsoN, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new Fluid- Pressure Devices, of which thefollowing is a specification.

The present ments in rotary able varies for transmitting power, such asfluid-operated motors or pumps.

' Such rota devices are rendered inefiicient by the act that thepressure between the shaft and the bearings is very many times as t asthat on the vanes, because the efl'ective area of each vaneis very muchless. than that part of the area of the rotor upon which there is apressure equal to that on the vane. Therefore the friction betweeinvention relates to improve fraction. of the ressure between thesurfaces of the shaft and tion of the elfective pressure. Hence the lossof efiiciency is very considerable.

The object of the resent invention is to provide means for re ucing thisloss.

A further object'is to provide means for between the shaft andring-carrying vanes.

t Figure 1 is a longitudinal vertical section of a rotary device of thecharacter described constructed in accordance with my invention; Figs. 2and 3 are vertical sectional views on the lines 2-2 and 3-3respectively; Fig. 4 is a horiand parts carried thereby.

view of a shaft 1 indicates a Referring the drawing, 0 duits 3, eitherof et or outlet conmghada ted to be connected respectively wit 1n et andoutlet pipes, not shown. Oonne.cted by bolts 4 ,to the ends of saidcasmg, but eccentric thereto, or heads 6, 7 through havin therewith abase 2 .and co ke ed thereto, as shown. at ho low rotor 11 coaxiallywith said heads and having extensions extension 12 is integral with therotor, and the extension 13 is secured thereto by bolts 14. The rotor 11is contained in the casing 1, but is eccentric thereto, and theextensions Specification of Letters Patent.

devices which employ movis a ring'23, from tween packing pieces 34 insaid the bearings,is a large frac.

thereof; Fig. 5 is a plan view of a rotor detached; Fig. 6 is a brokenplan rmed integral 12, 13, of whichthe 12,- 13, extend into pressurechambers 16 for ed in saidheads 6, 7, with,- and formed by a cylindricalwall 17 extending inwardly, or toward the rotor 11, fromthe outer planewall of said head.

The head 6 is reduced in diameter, as shown at 18 and aroundthe same canrotate a cylin rical flange19, extending coaxially with the shaft fromthe extension 13. Said head is still further reduced in diameter, asshown at 21, and around the same can rotate a bushing 22. Around saidbushing which extends integrally a vane 24 and also two pairs of rings26, 27, from which pairs extend integrally vanes 28 and 29 respectively.The vane 28 is keyed to the bushing, as shown at 31, but the other vanesare loose thereon. All of these wanes extend through longitudinallyextending cylindrical openings32 in thickened portions 33 of the wall ofthe rotor, and slide becylindrical openings, the outer surfaces of saidpiews being cylindricaljand the inner surfaces being plane to fitsmoothly agalnst the plane and coaxial there- Patented Mar. 18, 1919'. t

' Application filed April 10, 1917. Serial No. 160,922. I

Such being the construction, if pressure\ fluid be introduced betweenone duits, it the vanes in succession and will escape by the of saidcon- Wll'l rotate the rotor by impelling other conduit and, conversely,if the rotor be rotated by an external force, its-vanes will draw influid .by one of said conduits and propel it through the other.

It will be transmit pressure not only to the surface of the vane topropel the rotor, but will transmit the same pressure to the curvedsurface of the rotor itself, which, being coaxial with the shaft, isineflective for propelling the rotor, and it will also be seen that thearea of this latter surface is very many times as great as that .of theformer. The friction between the rotor shaft and its bearings dependsupon the latter pressure, and while this friction might be negligible ifit depended only able-when it depends upon thepressure {exerted upon therotor, and the loss of efliciency from this causeh'as been supposed tobe about from 15% to.25%.'

In my invention I remove this useless pressure of the rotor in thefollowing manner:

seen that the pressure fluid will From each of the divisions, orsections,

of the rotor between as the case may be.

'pairs of vanes,'and midway between said vanes, there extends at eachend ofthe rotor a conduit 37 leading from the fluid pressure chamber 38,inclosed by the vanes, the casing, the rotor and the heads, to a chamber39 in the adjacent head on the inner side of the extension 12, or 13,

The extensions are so. formed that the pressure fluid escaping throughsaid conduits 37 from the fluid pressure chamber 38 cannot escape fromsaid pressure chamber- 39 The combined lengths of the pressure chambers39 are equal to the length of the pressure chamber 38, and since, theradii of the rotor and extensions is the same, the combined areas of theextensions on which there .iseutward pressure is equal to the area ofthe rotor on which there is an equal inward pressure. Consequently, no

pressure on the rotor due to the pressure fluid is transmitted to theshaft.

The advantage of providing a bushing be-' tween the reduced portion 21of the head and the rings carrying the vanes is that the rotarymovementof the vanes and ringsrelatively to each other, and, therefore,also of j the bushing which is secured to one of the vanes, is butslight, and there is "very little .wear thereon, and while there isconsiderable relative movement, and consequent Wear, between the vanesand the reduced portion of the head, this is taken up by the bushing,which can easily be'replaced from time to time. 7 I p Since all of thevanes are mounted on the bushing, the centrifugal forces acting on thevanes will practically counter balance each ing therethrough memesother, so that the forceactingin the bushing cause will be practicallyelimldue to this nated. 1

I claim x 1. The combination of a casing having inlet and outletpassages and end casings, a

rotor rotating, in said central casing and ing extensions into said endcasings, said extensions forming pressure chambers in their inner sides,vanes forming, With said rotor and easing, central pressure chambers,and said rotor having oblong conduits leadfrom each of the latterpressure chambers to a corresponding one of the former chambers. I

3. The combination of a shaft, a casing ec centricallysurrounding saidshaft, a rotor within said casing and concentrically S111? rounding saidshaft,a bearing for the shaft having a cylindrical extensioneccentrically surrounding said shaft, a bushing around" and rings aroundthe bushsaid extension, ing and having vanes extending holes in therotor and contacting at their outer edges with said casing, one of saidrings being secured to the bushin OTTO W. JO SON.

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